It looks like you may be trying to open files that are shown on the Start screen but are unable to do so.

Please check that the file(s) actually exist at the same location as when they were previously opened/created. If they have been deleted/moved/renamed, etc., the Start screen will continue to show their thumbnails but you won’t be able to open them.

this was not the case. the files were in the same folder in which they were created and saved.
after several tests, i found that if the name file contains a special character (for example /), the file in the history page doesn’t open; if remove the special characher the same file opens regularly.
can you verify and possibly solve the bug?
thank for your attention,
enrica raviola